public Task HandleCallAsync(HttpContext httpContext)
{
if (GrpcProtocolHelpers.IsInvalidContentType(httpContext, out var error))
{
// This might be a CORS preflight request and CORS middleware hasn't been configured
if (GrpcProtocolHelpers.IsCorsPreflightRequest(httpContext))
{
GrpcServerLog.UnhandledCorsPreflightRequest(Logger);
GrpcProtocolHelpers.BuildHttpErrorResponse(httpContext.Response, StatusCodes.Status405MethodNotAllowed, StatusCode.Internal, "Unhandled CORS preflight request received. CORS may not be configured correctly in the application.");
httpContext.Response.Headers[HeaderNames.Allow] = HttpMethods.Post;
return(Task.CompletedTask);
}
else
{
GrpcServerLog.UnsupportedRequestContentType(Logger, httpContext.Request.ContentType);
GrpcProtocolHelpers.BuildHttpErrorResponse(httpContext.Response, StatusCodes.Status415UnsupportedMediaType, StatusCode.Internal, error);
return(Task.CompletedTask);
}
}
if (httpContext.Request.Protocol != GrpcProtocolConstants.Http2Protocol &&
httpContext.Request.Protocol != GrpcProtocolConstants.Http20Protocol)
{
GrpcServerLog.UnsupportedRequestProtocol(Logger, httpContext.Request.Protocol);
var protocolError = $"Request protocol '{httpContext.Request.Protocol}' is not supported.";
GrpcProtocolHelpers.BuildHttpErrorResponse(httpContext.Response, StatusCodes.Status426UpgradeRequired, StatusCode.Internal, protocolError);
httpContext.Response.Headers[HeaderNames.Upgrade] = GrpcProtocolConstants.Http2Protocol;
return(Task.CompletedTask);
}
var serverCallContext = new HttpContextServerCallContext(httpContext, MethodInvoker.Options, typeof(TRequest), typeof(TResponse), Logger);
httpContext.Features.Set <IServerCallContextFeature>(serverCallContext);
GrpcProtocolHelpers.AddProtocolHeaders(httpContext.Response);
try
{
serverCallContext.Initialize();
var handleCallTask = HandleCallAsyncCore(httpContext, serverCallContext);
if (handleCallTask.IsCompletedSuccessfully)
{
return(serverCallContext.EndCallAsync());
}
else
{
return(AwaitHandleCall(serverCallContext, MethodInvoker.Method, handleCallTask));
}
}
catch (Exception ex)
{
return(serverCallContext.ProcessHandlerErrorAsync(ex, MethodInvoker.Method.Name));
}
public bool Match(HttpContext httpContext, IRouter route, string routeKey, RouteValueDictionary values, RouteDirection routeDirection)
{
if (httpContext == null)
{
return(false);
}
// Constraint needs to be valid when a CORS preflight request is received so that CORS middleware will run
if (GrpcProtocolHelpers.IsCorsPreflightRequest(httpContext))
{
return(true);
}
if (!HttpMethods.IsPost(httpContext.Request.Method))
{
return(false);
}
return(CommonGrpcProtocolHelpers.IsContentType(GrpcProtocolConstants.GrpcContentType, httpContext.Request.ContentType) ||
CommonGrpcProtocolHelpers.IsContentType(GrpcProtocolConstants.GrpcWebContentType, httpContext.Request.ContentType) ||
CommonGrpcProtocolHelpers.IsContentType(GrpcProtocolConstants.GrpcWebTextContentType, httpContext.Request.ContentType));
}